Imaging of supersonic flow over a double elliptic surface

doi:10.1088/1674-1056/22/11/114703

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 114703-114703.doi: 10.1088/1674-1056/22/11/114703

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Imaging of supersonic flow over a double elliptic surface

张庆虎, 易仕和, 何霖, 朱杨柱, 陈植

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

收稿日期:2013-01-22 修回日期:2013-05-13 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11172326), the National Basic Research Program of China (Grant No. 2009CB724100), and the Scientific Research Program of National University of Defense Technology, China (Grant No. 0100010112001).

Imaging of supersonic flow over a double elliptic surface

Zhang Qing-Hu (张庆虎), Yi Shi-He (易仕和), He Lin (何霖), Zhu Yang-Zhu (朱杨柱), Chen Zhi (陈植)

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

Received:2013-01-22 Revised:2013-05-13 Online:2013-09-28 Published:2013-09-28
Contact: He Lin E-mail:helin.101sys@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11172326), the National Basic Research Program of China (Grant No. 2009CB724100), and the Scientific Research Program of National University of Defense Technology, China (Grant No. 0100010112001).

摘要/Abstract

摘要： The coherent structures of flow over a double elliptic surface are experimentally investigated in a supersonic low-noise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and velocity fields of both laminar and turbulent inflows over the test model are captured. Based on the time-correlation images, the spatial and temporal evolutionary characteristics of the coherent structures are investigated. The flow structures in the NPLS images are in good agreement with the velocity fluctuation fields by PIV. From statistically significant ensembles, spatial correlation analysis of both cases is performed to quantify the mean size and the orientation of coherent structures. The results indicate that the mean structure is elliptical in shape and the structural angles in the separated region of laminar inflow are slightly smaller than that of turbulent inflow. Moreover, the structural angles of both cases increase with their distance away from the wall.

关键词: coherent structures, separated flow, spatial correlation analysis, supersonic flow

Abstract: The coherent structures of flow over a double elliptic surface are experimentally investigated in a supersonic low-noise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and velocity fields of both laminar and turbulent inflows over the test model are captured. Based on the time-correlation images, the spatial and temporal evolutionary characteristics of the coherent structures are investigated. The flow structures in the NPLS images are in good agreement with the velocity fluctuation fields by PIV. From statistically significant ensembles, spatial correlation analysis of both cases is performed to quantify the mean size and the orientation of coherent structures. The results indicate that the mean structure is elliptical in shape and the structural angles in the separated region of laminar inflow are slightly smaller than that of turbulent inflow. Moreover, the structural angles of both cases increase with their distance away from the wall.

Key words: coherent structures, separated flow, spatial correlation analysis, supersonic flow

中图分类号: (Coherent structures)

47.27.De

47.32.Ff (Separated flows) 47.40.Ki (Supersonic and hypersonic flows) 47.80.Cb (Velocity measurements)

张庆虎, 易仕和, 何霖, 朱杨柱, 陈植. Imaging of supersonic flow over a double elliptic surface[J]. 中国物理B, 2013, 22(11): 114703-114703.

Zhang Qing-Hu (张庆虎), Yi Shi-He (易仕和), He Lin (何霖), Zhu Yang-Zhu (朱杨柱), Chen Zhi (陈植). Imaging of supersonic flow over a double elliptic surface[J]. Chin. Phys. B, 2013, 22(11): 114703-114703.

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Imaging of supersonic flow over a double elliptic surface

Imaging of supersonic flow over a double elliptic surface

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